Catalog Home Page

Sawfishes stealth revealed using computational fluid dynamics

Bradney, D.R., Davidson, A., Evans, S.P., Wueringer, B.E., Morgan, D.L. and Clausen, P.D. (2017) Sawfishes stealth revealed using computational fluid dynamics. Journal of Fish Biology, 90 (4). pp. 1584-1596.

Free to read: http://dx.doi.org/10.1111/jfb.13255
*No subscription required

Abstract

Detailed computational fluid dynamics simulations for the rostrum of three species of sawfish (Pristidae) revealed that negligible turbulent flow is generated from all rostra during lateral swipe prey manipulation and swimming. These results suggest that sawfishes are effective stealth hunters that may not be detected by their teleost prey's lateral line sensory system during pursuits. Moreover, during lateral swipes, the rostra were found to induce little velocity into the surrounding fluid. Consistent with previous data of sawfish feeding behaviour, these data indicate that the rostrum is therefore unlikely to be used to stir up the bottom to uncover benthic prey. Whilst swimming with the rostrum inclined at a small angle to the horizontal, the coefficient of drag of the rostrum is relatively low and the coefficient of lift is zero.

Publication Type: Journal Article
Murdoch Affiliation: Centre for Fish and Fisheries Research
Publisher: Blackwell Publishing Inc
Copyright: © 2017 The Fisheries Society of the British Isles
URI: http://researchrepository.murdoch.edu.au/id/eprint/35805
Item Control Page Item Control Page